<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        h1{
            /* 默认的是 display: block; */
            display:inline;
        }
        span{
            /* 默认的是 display: inline; */
            display: block;
            width: 200px;
            height: 200px;
        }
        img{
            /* 默认的是display:inline-block; */
            display: block;
        }
    </style>
</head>
<body>
    <!-- 块级标签 display:block-->
    <!-- 行内标签 display:inline-->
    <!-- 行内块标签 display:inline-block-->
    <h1>
        我是一个标题
    </h1>
    <p>
        我是一个段落
    </p>
    <span>
        span
    </span>
    <img src="./images/皮卡丘.jpg" alt="">
</body>

</html>